612372721 has 2 divisors, whose sum is σ = 612372722. Its totient is φ = 612372720.

The previous prime is 612372713. The next prime is 612372749. The reversal of 612372721 is 127273216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 465696400 + 146676321 = 21580^2 + 12111^2 .

It is a cyclic number.

It is not a de Polignac number, because 612372721 - 2³ = 612372713 is a prime.

It is not a weakly prime, because it can be changed into another prime (612372221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306186360 + 306186361.

It is an arithmetic number, because the mean of its divisors is an integer number (306186361).

Almost surely, 2^612372721 is an apocalyptic number.

It is an amenable number.

612372721 is a deficient number, since it is larger than the sum of its proper divisors (1).

612372721 is an equidigital number, since it uses as much as digits as its factorization.

612372721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 612372721 is about 24746.1657838139. The cubic root of 612372721 is about 849.1907966617.

The spelling of 612372721 in words is "six hundred twelve million, three hundred seventy-two thousand, seven hundred twenty-one".